Efficiencyandmechanismoftrimethoprimdegradationin Cl-/PMS system
GU Zhen-chuan1, GAO Nai-yun1, AN Na1, CHEN Ju-xiang2
1. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; 2. College of Architecture and Civil Engineering, Xinjiang University, Urumqi 830046, China
Abstract：Cl- activated peroxymonosulfate (PMS) wasusedto degrade trimethoprim (TMP).The active subustance generated in Cl-/PMS systemwas identified.Effects of chloride concentration,PMS dosage,initial pH value on the degradation efficiency of TMP were evaluated.Degradation pathway of TMP was exploredbasedon the identification of degradation intermediates.The results indicated thatthedegradationof TMP was mainly ascribedto the active chlorine species,which was generatedfrom the direct reaction of Cl- with PMS.TMP degradation kinetics fitted well with the pseudo-first-ordermodel.The reaction constant increased with the increasing of the Cl- concentration and PMS dosage.The corresponding degradation rate decreased firstly and then increased when the initial pH varied between 5.0 and 9.0.The results also indicated that TMP was notsubstantially destructed upon reactions with active chlorine specieswhileawide variety of (multi) chlorinated and hydroxylated productsare formed.
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